Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran.
Anal Chim Acta. 2012 Feb 17;715:80-5. doi: 10.1016/j.aca.2011.12.021. Epub 2011 Dec 20.
A novel fluorescence nano-chemosensor for Cr(2)O(7)(2-) anion has been developed by assembly of fluorescent aluminum complex of 8-hydroxyquinoline (AlQ(x)) within the channels of modified SBA-15. SBA-SPS-AlQ(x) shows a fluorescence emission at 486 nm. The observed remarkable fluorescence of SBA-SPS-AlQ(x) quenches in presence of Cr(2)O(7)(2-) anion. The results showed that this fluorescent nano-material can be a useful chemo-sensor for determination of dichromate anions in aqueous solutions. The linear detecting range of fluorescent nano-chemosensor for Cr(2)O(7)(2-) anion was 0.16-2.9 μmol L(-1). The lowest limit of detection (LDL) was also found to be 0.2 ng mL(-1) in aqueous solutions. SBA-SPS-AlQ(x) showed selectively and sensitively fluorescent quenching response toward Cr(2)O(7)(2-) ion in comparison with I(3)(-), NO(3)(-), CN(-), CO(3)(2-), Br(-), Cl(-), F(-), H(2)PO(4)(-) and SO(4)(2-) ions, which was because of the higher stability of its inorganic complex with dichromate ion.
一种新型荧光纳米化学传感器已被开发用于 Cr(2)O(7)(2-)阴离子，该传感器是通过将 8-羟基喹啉的荧光铝配合物（AlQ(x)）组装在改性 SBA-15 的通道内制成的。SBA-SPS-AlQ(x)在 486nm 处发出荧光发射。SBA-SPS-AlQ(x)的观察到的显著荧光在存在 Cr(2)O(7)(2-)阴离子时被猝灭。结果表明，这种荧光纳米材料可以作为测定水溶液中重铬酸根阴离子的有用化学传感器。荧光纳米化学传感器对 Cr(2)O(7)(2-)阴离子的线性检测范围为 0.16-2.9μmol L(-1)。在水溶液中，检测限（LDL）也被发现低至 0.2ng mL(-1)。与 I(3)(-)、NO(3)(-)、CN(-)、CO(3)(2-)、Br(-)、Cl(-)、F(-)、H(2)PO(4)(-)和 SO(4)(2-)离子相比，SBA-SPS-AlQ(x)对 Cr(2)O(7)(2-)离子表现出选择性和灵敏的荧光猝灭响应，这是因为其与重铬酸盐离子的无机配合物具有更高的稳定性。
